He Was 63 When His Son Was Born. His Son Was 71 When His Sons Were Born. Just A Bunch Of Dirty Old Men.

Only one today sadly. But that's still impressive by the fact that he was the 10th president (Term ended 176 years ago) That's actually a possibility. You could literally hear a conversation going like this
"Yeah, my dad was nine when the war started."
"WW2?"
"Nope!"
"Wow! WWI?"
"Nope, the Civil War"